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Acoustics: Sound Fields, Transducers and Vibration, 2nd Edition by Tim Mellow, Leo Beranek

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Chapter Fifteen

Electrostatic loudspeakers

Abstract

After a short introduction to the construction and general principles of an electrostatic loudspeaker, there follows an analysis of various methods for broadening the directivity pattern as well as the effects of using a delay line feeding discrete rings rather than a theoretical continuous delay. Design formulas are derived for designing a delay line to imitate an oscillating sphere including a method to neutralize stray capacitance. Next, a lumped-element model based on an analogous circuit is developed, which is valid when there is sufficient resistance (usually in the form of a dust screen) to suppress the membrane modes. From this, useful design formulas are derived.

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